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Installing tails from a new DNO 400A TPN cut-out to an existing panelboard

Patrick Benson

Hi All, we have been asked to install tails from a new DNO 400A TPN cut-out to an existing panelboard. This new DNO supply appears to be TN-S (we are trying to source the quotation to confirm the DNO supply arrangement.) The building is of steel frame cons

1No. PME and 1No. TN-S supply into a single steel frame building.

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  • 0 in reply to Patrick Benson

    Ah - yes, it it is unusual to supply two lots of TN-something to the same building if it has bonded steel without DNO saying its OK first ... I presume they do know about the other supply though ? IT is as noted more common for at least one of the supplies to be TT. 

    Mike.

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